66551454566 has 16 divisors (see below), whose sum is σ = 101738143584. Its totient is φ = 32639078784.

The previous prime is 66551454551. The next prime is 66551454589. The reversal of 66551454566 is 66545415566.

It is a super-2 number, since 2×66551454566² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319295 + ... + 484821.

It is an arithmetic number, because the mean of its divisors is an integer number (6358633974).

Almost surely, 2^66551454566 is an apocalyptic number.

66551454566 is a deficient number, since it is larger than the sum of its proper divisors (35186689018).

66551454566 is a wasteful number, since it uses less digits than its factorization.

66551454566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169375.

The product of its digits is 12960000, while the sum is 53.

The spelling of 66551454566 in words is "sixty-six billion, five hundred fifty-one million, four hundred fifty-four thousand, five hundred sixty-six".